TW201331684A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device using a wall electrode facilitates enclosing of liquid crystal and improves transmittance. The liquid crystal display device includes a plurality of pixels arranged in a matrix. Each of the pixels includes large walls, a small wall, a TFT-side electrode, and a wall electrode. The large walls extend in a long-side direction of the pixel at both ends of the pixel. The small wall extends parallel to the large walls between the large walls. The small wall has a height lower than the large walls. The TFT-side electrode is formed on the small wall. The wall electrode is formed on a side surface of the large wall and formed between the large wall and the small wall. The large walls are separated between the pixels in the long-side direction. The small wall which has a height lower than the large walls is arranged between the separated large walls. Additionally, the liquid crystal display device includes a drain line in the long-side direction of the pixel and a gate line in the short-side direction of the pixel. A common electrode is formed via the small wall in an upper layer of the drain line and the gate line.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device of a wall electrode type, and more particularly to a liquid crystal display device which facilitates sealing of liquid crystal and improves transmittance.

The liquid crystal display device is widely used in small portable terminals to large-sized televisions because of its high display quality, features such as thinness, light weight, and low power consumption.

On the other hand, in the liquid crystal display device, there is a problem of viewing angle characteristics, and in order to realize a wide viewing angle, an IPS (In-Plane Switching) liquid crystal display device has been proposed. The IPS method displays an image by applying an electric field in a direction parallel to the substrate to rotate the liquid crystal molecules in a horizontal plane while the liquid crystal molecules are horizontally lying, thereby controlling the amount of light of the backlight.

Patent Document 1 discloses a liquid crystal display device having m×n array pixels, an element operating in a pixel, a driving mechanism for applying a predetermined voltage waveform, and a certain pitch between the upper and lower substrates in the pixel. The electrode pair has a specific structure in which the alignment of the liquid crystal molecules is controlled by applying an electric field parallel to the substrate surface between the pair of electrodes to obtain light adjustment. (see summary)

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. Hei 6-214244

In order to realize a liquid crystal display device having an electrode pair between the upper and lower substrates and applying an electric field parallel to the substrate surface to control the alignment state of the liquid crystal molecules, the present invention firstly reviews the arrangement in the longitudinal direction of the pixel. A liquid crystal display device in which a gate line is disposed in a lower layer of the wall electrode and a gate line is disposed at a pixel end portion in the short side direction of the pixel. However, when the wall electrodes are connected between the pixels in the long-side direction, since the liquid crystal layers in the short-side direction are completely separated, the liquid crystal becomes difficult to be sealed, resulting in a decrease in the yield of the liquid crystal panel during mass production, resulting in cost. Upgrade.

In addition, when the black-and-white interactive display is performed in the short-side direction and the long-side direction of the pixel, when the electrode that shields the potential is not disposed on the drain line and the gate line, the pixel of the white display may be affected by the potential. The white penetration rate is lowered, and the black display pixel increases the black transmittance. Moreover, in the case where the pixel interval in the direction of the long side of the pixel is narrow, when the black and white interactive display is performed, the pixel of the black display increases the black transmittance and the white penetration rate decreases due to the influence of the potential of the adjacent pixel. . In this way, the display characteristics are deteriorated by the influence of the peripheral potential of the pixels such as the drain line, the gate line, and the adjacent pixels.

Further, in the case of a multi-domain structure, a region in which the liquid crystal alignment is twisted and reverse-twisted is mixed at the end of the pixel, and a domain is generated. This is caused by a decrease in the white penetration rate at the end of the pixel, which results in a decrease in the white penetration rate of the pixel as a whole.

An object of the present invention is to make a liquid crystal display device of a wall electrode type easy to seal and improve the transmittance.

In order to solve the above problems, the liquid crystal display device of the present invention is provided with array-shaped plural pixels, each pixel having a large wall extending at both ends of the pixel in the longitudinal direction of the pixel, and parallel to the large wall between the pixels a small wall extending and lower than a height of the large wall, wherein the small wall is formed with a TFT side electrode, and a wall electrode is formed between the large wall side and the large wall and the small wall, wherein the large wall The wall system is divided between the pixels in the longitudinal direction, and a small wall having a height lower than the height of the large wall is disposed between the large walls after the division.

In the liquid crystal display device of the present invention, the pixels may be continuously disposed at both ends of the pixel with the small wall extending in the short side direction of the pixel.

Further, in the liquid crystal display device of the present invention, the drain line in the longitudinal direction of the pixel and the gate line in the short-side direction may be provided, and the upper layer of the drain line and the gate line are formed to have commonalities through the small wall. (common) electrode.

Moreover, in the liquid crystal display device of the present invention, the common electrode can be connected to a common electrode of a neighboring pixel in the short-side direction and the long-side direction of the pixel.

Further, in the liquid crystal display device of the present invention, the gate electrode in the short-side direction of the pixel can pass through the interlayer insulating film to form a common electrode.

Further, in the liquid crystal display device of the present invention, the storage capacitor electrode formed in the planar direction of the substrate is connected to the TFT side electrode, and The planar electrode whose wall electrode extends in the planar direction of the substrate can be opposed to the interlayer insulating film to form a capacitor element.

In the liquid crystal display device of the present invention, an array of a plurality of pixels is disposed, each of the pixels having a large wall extending at both ends of the pixel in a longitudinal direction of the pixel, and parallel to the large wall between the large walls a small wall extending lower than the height of the large wall, the TFT side electrode is formed as a common electrode on the small wall, and a wall electrode is formed as a source between the large wall side surface and the large wall and the small wall a pole electrode; wherein the end of the small wall is formed with a curved portion facing the large wall, and the common electrode is formed on the curved portion.

In the liquid crystal display device of the present invention, the front end of the bent portion may be formed in an acute angle or a circular shape.

Further, in the liquid crystal display device of the present invention, the distance between the large wall and the small wall may be k, and the length L of the curved portion is k/4 < L < 3 k / 4.

Further, in the liquid crystal display device of the present invention, the storage capacitor electrode formed in the planar direction of the substrate connected to the TFT side electrode is opposed to the planar electrode extending in the planar direction of the substrate by the wall electrode, and is opposed to the interlayer insulating film. A capacitive element is formed.

Further, in the liquid crystal display device of the present invention, the gate electrode in the short-side direction of the pixel can pass through the interlayer insulating film to form a common electrode.

According to the present invention, when the liquid crystal display device is manufactured, the liquid crystal can be stably sealed, and the cost can be reduced due to the improvement in yield. Moreover, it is possible to shield the influence of the potential of the drain line, the gate line, and the adjacent pixels, thereby achieving an increase in suppression of black transmittance and a decrease in white penetration rate. low. Furthermore, it is possible to suppress the domain of the end of the pixel, and to reduce the darkened area, and to obtain high transmittance in the entire pixel.

Hereinafter, embodiments of the present invention will be described based on the drawings. In the drawings, the same reference numerals will be given to components having the same functions, and the description thereof will be omitted.

(Example 1)

First, Fig. 14 is a view showing an example of an equivalent circuit of a liquid crystal display device to which the present invention is applied. An array of scanning lines 104 and signal lines 103 are disposed on the substrate 102, and pixels 103 are connected to the intersections of the scanning lines 104 and the signal lines 103 through the TFT (Thin Film Transistor) element 110. A scan driving circuit 108 and a signal driving circuit 107 are connected to the scanning line 104 and the signal line 103, respectively, and a voltage is applied to the scanning line 104 and the signal line 103. A common line 105 parallel to the signal line 103 is disposed on the substrate 102, and is configured to apply a common voltage from the common voltage generating circuit 109 to all pixels. A liquid crystal composition is sealed between the substrate 102 and the substrate 101, and the liquid crystal display device is formed as a whole.

1 is a plan view showing a planar structure of a pixel associated with Embodiment 1 of the present invention, and FIG. 2 is a plan view showing a plane of a pixel of FIG. 3, FIG. 4 (FIG. 5), FIG. 6 (FIG. 7), and FIG. 8 are the A-A' plane, the B-B' plane, the C-C' plane, and the D-D' plane of FIG. 1, respectively. The cut structure is cut. Such as As shown in Fig. 1, the planar structure of the pixel of the present invention has a cross-sectional structure different from the end portion of the central portion (A-A' plane) of the pixel. Further, the plane of the planar structure described below is a structure related to the electrode seen in the liquid crystal layer.

First, the description will be made on the A-A' side of the central part of the pixel. As shown in FIG. 3, the cross-sectional structure of the A-A' plane has a large-wall structure (hereinafter referred to as a large wall 14) disposed at both ends of the pixel, and a wall electrode having an electrode covering the side surface of the large wall 14 is formed. 211, and a planar electrode 212 extending in a planar direction by a wall electrode connected to a surface of the substrate. The wall electrode is electrically connected to the planar electrode, and the wall electrode 211 and the planar electrode 212 are collectively referred to as the wall electrode 21. Between the large-wall structures of the realm of the picture, there is a low-wall structure (hereinafter referred to as a small wall 15) having a relatively high wall structure. A common electrode (hereinafter referred to as a TFT side electrode 16) is formed to cover the small wall 15, and a common electrode (hereinafter referred to as a storage capacitor electrode 17) is formed in a plane direction by a surface of the small wall 15 connected to the substrate. The planar electrode 212 of the wall electrode 21 is formed on the upper layer of the storage capacitor electrode 17 through the interlayer insulating film 20. Further, an insulating film 22 and an alignment film 23 are disposed between the planar electrode 212 and the liquid crystal layer 24. Further, a pair of electrodes (the TFT side electrode 16 and the CF side electrode 26 (hereinafter referred to as a pseudo wall electrode)) are disposed between the wall electrodes 21 of the pixel boundary. In this embodiment, although the wall electrode 21 at both ends of the pixel is used as the source electrode and the pseudo-wall electrode is used as the common electrode, the wall electrode at both ends of the pixel may be used as the common electrode, and the pseudo-wall electrode may be used as the common electrode. Source electrode. In addition, the small wall system has a wall having a height of at least 1 μm, In one pixel, there are two types of wall structures of a large wall 14 and a small wall 15 .

Next, the cross section of B-B' of Fig. 4 will be described. As shown in FIG. 4, the A-A' plane of the central portion of the pixel is formed with a large wall 14 on the upper surface of the drain line 13, and the B-B' surface is transmitted through the upper layer of the drain line 13 and the gate line 11. The common electrode 19 is disposed on the small wall 18. The reason why the pixel in the longitudinal direction of the pixel is the small wall 18 is that the liquid crystal layer is not only the longitudinal direction of the pixel, but also the adjacent pixels in the short side direction are connected, and the liquid crystal can be easily sealed. Further, there are two reasons why the non-thin interlayer insulating film on the B-B' plane is not a thin interlayer insulating film. The first one is that the small wall 18 is formed on the upper layer of the drain line 13 and the gate line 11. Since the drain line and the gate line and the common electrode 19 can be greatly separated, the parasitic line and the gate line can be parasitic. The capacitance (hereinafter referred to as parasitic capacitance) becomes small, making the signal easy to transmit. On the other hand, since the small wall 18 can be formed in the same manner as the small wall 15 provided between the large walls at both ends of the pixel, it is not necessary to add another layer. For this reason, by providing a small wall on the drain line and the gate line of the B-B' plane at the end of the pixel, it is possible to easily enclose the liquid crystal and suppress the parasitic line of the drain line and the gate line. The increase in capacitance and the number of suppression layers.

As shown in FIG. 2, the common electrode 19 has a structure in which the pixels are connected in the longitudinal direction and the short-side direction. The source electrode of the wall electrode 21 is formed in the upper layer of the common electrode through the interlayer insulating film 20, and the common electrode 18 is formed on the upper surface of the small wall 18 disposed on the drain line 13 and the gate line 11. As long as this electrode is constructed, the drain line and the gate line layer Since the common electrode or the source electrode is inevitably present, the potential of the drain line and the gate line can be shielded by the electrodes. In addition to this, regarding the peripheral potential of the pixel, it is necessary to consider the potential influence of the adjacent pixels in the case where the long side of the pixel is interactively displayed in black and white. With respect to this problem, since the common electrode 19 is connected to the adjacent pixels in the structure of the present invention, even if the black and white display is alternately performed in the longitudinal direction of the pixel, the potential of the pixel of the black display pixel can be shielded by the common electrode. Since the influence (hereinafter referred to as the potential influence of the adjacent pixels) is suppressed, the black transmittance due to the influence of the potential of the adjacent pixels can be suppressed from increasing. Further, since the common electrode system is connected to the adjacent pixels in the longitudinal direction and the short-side direction of the pixel, there is no possibility that the signal cannot be supplied even if the position is broken, which is related to the improvement of the yield. As apparent from the above, the present invention can suppress the parasitic capacitance of the drain line and the gate line, suppress the increase in the number of layers, and suppress the influence of the potential of the adjacent pixels, thereby improving the yield in the process.

Further, even if the B-B' plane is replaced with the structure of Fig. 4 and the structure of Fig. 5, the same effect can be obtained. Fig. 5 is a cross-sectional view showing the B-B' plane of Fig. 1 in a configuration in which a small wall 18 is disposed above the drain line 13, and a common electrode 19 is disposed on the upper layer of the small wall 18 and the gate line 11. The liquid crystal layer 24 of this structure is not only the longitudinal direction of the pixel, but also the adjacent pixels in the short-side direction are also connected, so that the sealing of the liquid crystal is facilitated. Further, since the common electrode 19 has a small wall 18 disposed between the drain electrode 13 and the distance from the drain line is extended, the parasitic capacitance of the drain line 13 can be suppressed. Regarding the upper layer of the gate line 11, since the gate line is formed in the lower layer than the drain line, there is no common electrode 19 and gate line even if there is no small wall. The film thickness between 11 is increased to become a large parasitic capacitance. Further, as shown in FIG. 2, the common electrode 19 formed on the upper layer of the small wall 18 is connected to the pixel in the direction of the pole side in the longitudinal direction of the pixel, so that the common electrode 19 can be shielded by the common electrode 19 between the pixels. The influence of the potential of the adjacent pixels in the edge direction. Thereby, even if the black and white display is alternately performed in the longitudinal direction of the pixel, the influence of the potential of the adjacent pixels can be shielded, and the increase in the black transmittance due to the influence of the potential of the adjacent pixels can be suppressed. Further, since the common electrode 19 is formed on the upper surface of the gate line 11 and the drain line 13, the influence of the peripheral potential of the pixel such as the gate line and the drain line can be completely blocked. Furthermore, since the common electrode 19 is connected to the adjacent pixels in the longitudinal direction and the short-side direction of the pixel, there is no possibility that the signal cannot be supplied even if the position is broken, which is related to the improvement of the yield. As can be seen from the above, the structure of FIG. 5 can also suppress the parasitic capacitance of the drain line, suppress the increase in the number of layers, and suppress the influence of the potential of the adjacent pixels, thereby improving the yield.

On the other hand, since the transmittance of the region generating portion is lowered when the end portion of the pixel is generated, it is necessary to consider the region suppression. The area suppression must take into account the C-C' plane and the D-D' plane of the pixel end structure. 6 and 7 are examples of the C-C' plane. Figure 7 is an example of a continuous small wall 18 disposed between the ends of a pixel. On the other hand, although the C-C' plane of Fig. 6 is not provided with a small wall between the small walls 18 disposed at both ends of the pixel, the small wall may not be patterned as shown in Fig. 7.

Further, Fig. 8 shows a cross-sectional structure of the D-D' plane. As shown in FIG. 8, the width of the small wall 15 formed between the large walls 14 at both ends of the pixel is widened. The structure of Fig. 9 is an enlarged view of the pixels of the C-C' plane and the D-D' plane of the pixel end. This reason will be described using FIG. 9. Fig. 9 is an enlarged view showing the end portion of the pixel in the present invention, and recording the direction of the electric field and the initial alignment direction of the liquid crystal. Further, the liquid crystal is twisted in the -θ direction with respect to the initial alignment direction, and the reverse direction is twisted in the θ direction, and an electric field is applied to the liquid crystal to be aligned in the electric field direction. The reason for the occurrence of the region is that the tuned and reverse twists are mixed in the pixels.

As shown in FIG. 9, when the source electrode is surrounded by the curved small wall periphery so that the signal potential is easily supplied, an electric field in the reverse twist direction is generated at the tip end of the common electrode, and an electric field in the forward direction is generated in the direction other than the tip end portion. . Considering such a situation and reviewing the area suppression, it has been found that it is important to suppress the electric field in the direction of the torsional direction in the region where the electric field in the reverse twist direction is generated. As shown in FIG. 9, when the co-current extremely curved structure formed by the upper layer of the small-wall structure of the pixel end portion is formed, the interval between the source electrode and the common electrode of the wall electrode is shortened, and the bending is not provided. In the case of the portion, the electric field in the direction of the torsion in the direction between the wall electrode and the common electrode becomes strong. Even if the bending portion is formed, an electric field in a part of the reverse torsion direction is generated, but the liquid crystal propagation of the reverse torsion in the end portion of the pixel is suppressed by the strong electric field in the direction of the torsion, and the region is suppressed. In such a case, even if the cross-sectional structure on the C-C' plane is both in Figs. 6 and 7, the positional relationship between the source electrode and the common electrode is the same, so that the area suppressing effect can be obtained. In addition, the distance between the source electrode and the common electrode of the wall electrode is the wall electrode side The distance between the face and the front end of the bend.

As shown in FIG. 8, the curved portions 30 are preferably upper layers of the small walls 15. The reason for this is that the insulating film 22 is present between the common electrode and the liquid crystal layer 24 in the absence of a small wall, and the voltage of the insulating film is increased in thickness, so that the electric field in the torsional direction becomes weak. On the other hand, if the common electrode is disposed on the upper layer of the small wall 15, the voltage does not decrease, and a strong forward-direction electric field can be applied between the common electrode and the source electrode which is the wall electrode. Therefore, in order to suppress the area, it is effective to form the curved portion 30 of the common electrode in the upper layer of the small wall 15.

In Table 1, the area suppression effect of the present invention is shown. Table 1 is an observation result of a pixel in which the length of the curved portion of the small wall is taken as a parameter. As shown in Table 1, in the case where the end portion of the pixel has no bent portion, the distance between the source electrode and the common electrode becomes long, and the electric field in the forward twist direction becomes weak, so that the area becomes large. On the other hand, the curved portion was provided regardless of the length of the curved portion, and it was confirmed that the region where the pixel end portion is generated can be made small. Therefore, it has been confirmed that the source electrode and the common electrode are narrowed to each other, and a strong electric field in the direction of the torsion is applied around the generated region, thereby suppressing the region. On the other hand, in the case where the bent portion is long, the area is made small, but it is confirmed that the area surrounded by the common electrode extending in the longitudinal direction and the common electrode of the bent portion is darkened. The reason for this is that the electric field in the region surrounded by the common electrode is difficult to reach, and the liquid crystal is difficult to operate.

Fig. 10 is a graph showing the dependence of the length of the bending portion of the transmittance in the end portion of the pixel. In addition, the normalized penetration rate is based on the absence of bends. The penetration rate of the case is the specification standard. When the distance between the center of the short side direction of the pixel (the center of the small wall 15) and the side of the large wall is k, and the length of the curved portion is k/4, the case where the curved portion is not increased is greatly improved, and the length of the curved portion is increased. When it is 3k/4 or more, it will become smaller. Therefore, it is important that the length of the curved portion 30 is not longer than the length of the region, and it is not necessary to increase the length of the darkened region. That is, the length L of the bent portion is preferably k/4 < L < 3 k/4. By making the length of the curved portion to this extent, both the suppression of the region and the reduction of the darkened region can be established, and even at the end of the pixel, high transmittance can be achieved, and the high transmittance of the pixel as a whole can be achieved.

11, FIG. 12, and FIG. 13 show an example of the shape of the tip end of the curved portion of the common electrode. Fig. 11 shows that the shape of the front end of the curved portion is an acute angle, and Fig. 12 is such that the shape of the front end of the curved portion becomes a sharper angle, and Fig. 13 is a shape in which the shape of the front end of the curved portion is rounded. Even in any shape, a zone suppression effect is obtained. Therefore, both the suppression of the region and the suppression of the darkening region can be established, and the high transmittance can be achieved even at the end of the pixel.

It can be seen from the above that the liquid crystal seal can be easily realized by the present invention. Into, suppress the parasitic capacitance of the drain line and the gate line, increase the number of suppression layers, and suppress the influence of the potential of the adjacent pixels, so that both the region suppression of the pixel end and the suppression of the darkening region are established, and the pixel is realized. Overall high penetration rate.

(Example 2)

Figure 15 is a cross-sectional view showing a pixel of Embodiment 2 of the present invention. In the first embodiment, the CF side electrode 26 is disposed to form the pseudo wall electrode, but the second side electrode 26 is not provided in the second embodiment. In this embodiment, it is also possible to easily block the liquid crystal, suppress the parasitic capacitance of the drain line and the gate line, suppress the increase in the number of layers, and suppress the influence of the potential of the adjacent pixels, thereby suppressing and darkening the area of the pixel end. Both of the regional suppression are established, and the high penetration rate of the pixel is achieved as a whole.

10‧‧‧ pixels

11‧‧‧ gate line

12‧‧‧Interlayer insulating film

13‧‧‧汲polar line

14‧‧‧Great wall

15‧‧‧Small wall between large walls

16‧‧‧TFT side electrode

17‧‧‧ Storage Capacitor

18‧‧‧ small wall between the elements

19‧‧‧Common electrodes on small wall structures

20‧‧‧Interlayer insulating film

21‧‧‧ wall electrode

211‧‧‧ wall electrode

212‧‧‧ planar electrode

22‧‧‧Insulation film

23‧‧‧Alignment film

24‧‧‧Liquid layer

25‧‧‧Protective film

26‧‧‧CF side electrode

27‧‧‧CF (Color Filter)

28‧‧‧BM (black array)

30‧‧‧Bend

101‧‧‧Substrate

102‧‧‧Substrate

103‧‧‧Signal line

104‧‧‧ scan line

105‧‧‧Common line

106‧‧‧ pixels

107‧‧‧Signal drive circuit

108‧‧‧Scan drive circuit

109‧‧‧Common voltage generating circuit

110‧‧‧TFT components

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a planar configuration of a pixel of a first embodiment of the present invention.

Fig. 2 is a plan view showing the configuration of a 6-pixel plane in the first embodiment of the present invention.

Fig. 3 is a sectional structural view showing the A-A' plane of Fig. 1.

Fig. 4 is a sectional structural view showing the B-B' plane of Fig. 1.

Fig. 5 is a cross-sectional structural view showing the B-B' plane of Fig. 1.

Fig. 6 is a sectional structural view showing a C-C' plane of Fig. 1.

Fig. 7 is a view showing another sectional configuration of the C-C' plane of Fig. 1.

Fig. 8 is a sectional structural view showing the D-D' plane of Fig. 1.

Fig. 9 is a view showing the direction of electric field and the initial alignment direction of liquid crystal in the pixel end portion of the first embodiment of the present invention.

Fig. 10 is a graph showing the dependence of the length of the bending portion of the transmittance in the end portion of the pixel.

Fig. 11 is a view showing an example of the shape of the front end of the common electrode bending portion.

Fig. 12 is a view showing another example of the shape of the front end of the common electrode bending portion.

Fig. 13 is a view showing another example of the shape of the front end of the common electrode bending portion.

Fig. 14 is a view showing an example of an equivalent circuit of a liquid crystal display device to which the present invention is applied.

Figure 15 is a cross-sectional structural view showing a pixel of Embodiment 2 of the present invention.

10‧‧‧ pixels

14‧‧‧Great wall

15‧‧‧Small wall between large walls

16‧‧‧TFT side electrode

18‧‧‧ small wall between the elements

19‧‧‧Common electrodes on small wall structures

21‧‧‧ wall electrode

Claims (12)

A liquid crystal display device is provided with an array of plural pixels, each pixel having a large wall extending at both ends of the pixel in a longitudinal direction of the pixel, and extending parallel to the large wall between the large walls and a small wall having a lower height than the large wall, wherein the small wall is formed with a TFT side electrode, and a wall electrode is formed between the large wall side and the large wall and the small wall; wherein the large wall has a long side The pixels of the direction are divided, and the small walls after the division are disposed with a small wall lower than the height of the large wall. The liquid crystal display device of claim 1, wherein the pixels are continuously disposed at both ends of the pixel with the small wall extending in the short side direction of the pixel. The liquid crystal display device of claim 2, wherein the gate line having a long side direction of the pixel and the gate line of the short side direction pass through the small wall of the upper layer of the drain line and the gate line. A common electrode is formed. The liquid crystal display device of claim 3, wherein the common electrode is connected to a common electrode of a neighboring pixel in a short side direction and a long side direction of the pixel. The liquid crystal display device of claim 1, wherein the gate electrode in the short-side direction of the pixel transmits a interlayer insulating film to form a common electrode. For example, the liquid crystal display device of claim 1 of the patent scope, wherein The storage capacitor electrode formed by connecting the TFT side electrodes in the planar direction of the substrate and the planar electrode extending from the planar electrode in the planar direction of the substrate are opposed to each other to form a capacitor element. A liquid crystal display device is provided with an array of plural pixels, each pixel having a large wall extending at both ends of the pixel in a longitudinal direction of the pixel, and extending parallel to the large wall between the large walls and a small wall having a lower height than the large wall, wherein the small wall is formed with a TFT side electrode as a common electrode, and a wall electrode is formed as a source electrode between the large wall side surface and the large wall and the small wall Wherein the end of the small wall is formed with a curved portion facing the large wall, and the common electrode is formed on the curved portion. The liquid crystal display device of claim 7, wherein the front end of the curved portion is formed in an acute angle or a circular shape. The liquid crystal display device of claim 7, wherein the distance between the large wall and the small wall is k, and the length L of the curved portion is k/4 < L < 3 k/4. The liquid crystal display device of claim 7, wherein the storage capacitor electrode formed in the substrate plane direction connected to the TFT side electrode and the planar electrode layer extending from the wall electrode in the planar direction of the substrate are permeable to the interlayer insulating film. To form a capacitive element. The liquid crystal display device of claim 7, wherein the The gate line in the short-side direction of the pixel penetrates the interlayer insulating film to form a common electrode. The liquid crystal display device of claim 7 is characterized in that: a drain line having a long side in a pixel direction and a gate line in a short side direction, wherein the upper layer of the drain line and the gate line pass through the small wall A common electrode is formed.